Tandem stroller



FIG. 1 is a front right perspective view of a tandem stroller showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side view being substantially a mirror image of the right side view;

FIG. 4 is a rear right perspective view of thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a tandem stroller, as shown and described. 